if anyone is interested ( a year later ) then you can calculate how many calories you need each day with the following formulas..
For Men
BMR = 66 + (13.7 x weight in kg) + (5 x height in cm) - (6.8 x age)
So for a 30 year old bodybuilder of 220lbs (100kg) at 5'11" (178cm) it comes up to:
BMR = 66 + (13.7 x 100kg) + (5 x 178cm) – (6.8 x 30)
BMR = 2122 calories per day
For Women
BMR = 655 + (9.6 x weight in kg) + (1.7 x height in cm) - (4.7 x age)
So for a 28 year old figure girl of 132lbs (60kg) at 5'6" (165cm) it comes up to:
BMR = 655 + (9.6 x 60kg) + (1.7 x 165cm) – (4.7 x 28)
BMR = 1380 calories per day
Your basal metabolic rate (BMR) simply means the amount of energy used by your body during a 24-hour period if no activity is performed. In other words, if you're inactive for 24-hours straight, you'd still "burn" the amount of calories equivalent to your BMR.
Your BMR is a function of your size, sex, and age. It's also influenced by your metabolic status (hypo or hyperthyroid state for example). We can calculate BMR with the following formulas (by Harris-Benedict):
Second Step: Factoring in activity level
The amount of calories found using the Harris-Benedict formula is what your body burns every day, even if you do nothing all day. Obviously, the more active you are the more you'll burn fuel. So, energy expenditure will be increased when your activity level goes up.
To get an adequate estimation you need to multiply your BMR by an activity level factor:
Activity level factor
Activity level
1.0
Sedentary
1.2
Very light activity
1.4
Light activity
1.6
Moderate activity
1.8
High activity
2.0
Extreme activity
By sedentary we mean doing nothing all day (sleeping and watching TV).
By very light activity we mean doing nothing physical. Working a desk job or on a computer and not performing any type of physical activity during your day.
By light activity we mean having a non-physical job (desk, computer, etc.) but performing some sort of physical activity during the day (e.g. above average walking) but no hard training.
By moderate activity we mean having a non-physical job, performing some sort of physical activity during the day, and including a daily workout session in your routine.
By high activity we mean either training plus a physical job or non-physical job and twice-a-day training sessions.
By extreme activity we mean a very physical job and daily hard training